Systems Security Administrator Job at Robert Half (San Antonio)

IT Systems, Network, & Security Administrator

We’re seeking a IT Systems, Network, & Security Administrator for a project-base...

Location

United States , Los Angeles

Salary:

Not provided

Tech Holding

Expiration Date

Until further notice

Requirements

Bachelor’s degree from an accredited university in Business, Technology, or a related field required
At least 3 years of experience in an IT Systems Admin, Security Admin, or Senior IT Support role
Prior experience with cloud-based email security software, preferably Mimecast
Experience with mobile device management (MDM), preferably Microsoft Intune and/or Kandji
Strong knowledge of Microsoft 365 administration and Entra ID
Prior experience troubleshooting identity, access, and MFA-related issues
Solid understanding of email security concepts such as phishing, spoofing, DMARC, DKIM, and SPF
Comfortable supporting a mixed Windows and macOS environment
Ability to work in an unstructured, fast-paced environment while making sound judgment calls in security and user access scenarios
Must have a valid driver’s license and a reliable and fully insured vehicle as this role will be traveling throughout Los Angeles to support staff at LAFC Headquarters, BMO Stadium, and the LAFC Performance Center at California State University – Los Angeles

Job Responsibility

Administer and support the organization’s cloud-based email security platform, Mimecast, for issues relating to threat investigation, message tracing, and policy management
Monitor and respond to phishing, spoofing, and impersonation attempts
Perform physical network troubleshooting, including identifying cabling faults, checking patch panels, validating link lights, and ensuring proper switch/AP connectivity
Support the organization’s cloud-based identity and access management platform, Okta, day-to-day operations regarding user access, SSO access to internal and SaaS applications, and multi-factor authorization (MFA) issue resolution
Manage and monitor the organization's mobile device management (MDM) platforms, Microsoft Intune and Kandji, troubleshooting MDM enrollment issues, profile errors, and missing agents
Provide support and troubleshoot device compliance, deployment, and access issues for Windows and macOS devices
Oversee user account management in Microsoft 365, Entra ID, and Active Directory
Support employee onboarding and offboarding, including user provisioning, device setup, and access changes
Provide Tier 1–3 helpdesk support, including MFA, password resets, access issues, and escalation handling
Review and triage security alerts in Microsoft Defender and Entra ID

Systems Security Administrator

This position offers a long term contract employment opportunity in the tech ind...

Location

United States , New York

Salary:

Not provided

Robert Half

Expiration Date

Until further notice

Requirements

Proven experience in Access Control
Proficient in Cisco Technologies
Knowledge of Firewall Technologies
Familiarity with Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS)
Competence in managing Active Directory
Proficiency in Auditing
Experience with Authentication processes
Practical understanding of Computer Hardware
Expertise in Configuration Management

Job Responsibility

Administer system security measures including access control and firewall technologies
Handle customer tickets with efficiency and accuracy
Set up systems for new hires, ensuring all necessary software and hardware are properly configured
Proactively manage and monitor customer accounts, initiating appropriate action when required
Deploy new laptops, maintaining a balance of Windows and Mac systems
Spearhead the transition towards a zero touch deployment model
Utilize your skills in Cisco Technologies, IDS, IPS, Active Directory, Auditing, Authentication, and Configuration Management
Adapt to changes in ticketing systems, maintaining the same level of service regardless of the platform used
Undertake ad hoc system administration tasks as and when required
Maintain a manual process for laptop setup while exploring more efficient methods

What we offer

medical, vision, dental, and life and disability insurance
eligible to enroll in our company 401(k) plan

Fulltime

HPC System Administrator

Provide technology consulting to external customers and internal project teams. ...

Location

United States , Stennis

Salary:

101900.00 - 234500.00 USD / Year

Hewlett Packard Enterprise

Expiration Date

Until further notice

Requirements

Top Secret Clearance, TS/SCI preferred
Security+ and Linux+ certification
8+ years of professional experience and a Bachelor of Arts/Science or equivalent degree in computer science or related area of study
without a degree, three additional years of relevant professional experience (11+ years in total)
CompTIA Security+ Certification Required
CompTIA Linux+ Certification Required
TS Clearance Required

Job Responsibility

Monitoring and maintaining system health on the HPC system(s) – compute, network and storage
Reviewing, resolving and responding to client tickets
Creating, monitoring and closing all support cases
Maintaining availability reports for tracking SLA’s
Planning, scheduling and completing monthly patch upgrades on all systems and 6-month kernel upgrades
Maintaining the system security posture required by the client
Assisting the client with app installations
Troubleshooting and repairing hardware issues
Tracking/documenting the hardware repairs as well as opening, tracking, closing part cases and returning replaced parts
Maintaining the on-call schedule to support our 365 24x7x2/4 contracts

What we offer

Health & Wellbeing
Personal & Professional Development
Unconditional Inclusion

Fulltime

High Performance Compute Linux System Administrator

High Performance Compute Linux System Administrator role providing technology co...

Location

United States , Vicksburg

Salary:

101900.00 - 234500.00 USD / Year

Hewlett Packard Enterprise

Expiration Date

Until further notice

Requirements

Top Secret Clearance, TS/SCI preferred
Security+ certification
Linux+ certification
5+ years of Linux System Administration Experience
Bachelor's degree in computer science or related area (or 8+ years total experience without degree)
On-site availability 5 days a week
Ability to work on-call/weekend work
HPC system administration experience
Troubleshooting and hardware repair skills
System security maintenance

Job Responsibility

Monitoring and maintaining system health on HPC systems
Reviewing and resolving client tickets
Creating and closing support cases
Maintaining availability reports for SLA tracking
Planning and completing monthly patch upgrades and kernel upgrades
Maintaining system security posture
Assisting with application installations
Troubleshooting and repairing hardware issues
Tracking hardware repairs and part returns
Maintaining on-call schedule

What we offer

Health & wellbeing benefits
Personal & professional development programs
Comprehensive benefits suite
Inclusive work environment
Career development programs

Fulltime

High Performance Computer Linux System Administrator

High Performance Computer Linux System Administrator role providing technology c...

Location

United States , Stennis

Salary:

101900.00 - 234500.00 USD / Year

Hewlett Packard Enterprise

Expiration Date

Until further notice

Requirements

Top Secret Clearance (TS/SCI preferred)
CompTIA Security+ certification
CompTIA Linux+ certification
5+ years of Linux System Administration Experience
Bachelor's degree in computer science or related field (or 8+ years total experience without degree)
On-site availability 5 days per week
Willingness for on-call/weekend work
HPC system administration experience
System health monitoring and maintenance skills
Hardware troubleshooting and repair skills

Job Responsibility

Monitoring and maintaining system health on HPC systems
Reviewing and resolving client tickets
Creating and closing support cases
Maintaining availability reports for SLAs
Planning and completing monthly patch upgrades and kernel upgrades
Maintaining system security posture
Assisting with application installations
Troubleshooting and repairing hardware issues
Tracking hardware repairs and part cases
Maintaining on-call schedule

What we offer

Health & wellbeing benefits
Personal & professional development programs
Unconditional inclusion policy
Comprehensive benefits suite
Career development programs

Fulltime

Cloud Systems Administrator

Knight Federal Solutions is a trusted provider to industry leading prime contrac...

Location

United States , Arlington

Salary:

Not provided

Knight Federal Solutions

Expiration Date

Until further notice

Requirements

2 years of general systems administration experience demonstrating progressive responsibilities
2 years of experience performing Windows or Linux system administration duties
Experience with Splunk, STIGs and SCAP Scans
Experience supporting a cloud environment (AWS preferred) to include delivering, securing/managing and diagnosing/troubleshooting complex issues
Experience in a DevSecOps focused environment (e.g., working with configuration management tools, applying automation & infrastructure as code concepts)
Bachelor’s Degree in Technical Discipline, or 4 years of equivalent professional or military experience can be used in lieu of degree requirements
Active TS/SCI clearance required

Job Responsibility

Familiarity with configuration management and engineering life-cycle best practices
Implementing, testing, and documenting system configurations
Hardening systems to meet security standards
Troubleshooting issues
Sustaining production systems that serve many end users

Staff Systems Administrator

As a Staff Systems Administrator, you will play a vital role in maintaining, mon...

Location

Australia , Canberra; Brisbane

Salary:

Not provided

Bluestaq

Expiration Date

Until further notice

Requirements

Minimum 8–10 years of systems administration or information technology experience supporting mission-critical environments
Relevant tertiary qualification in information technology or equivalent experience
Demonstrated proficiency in Linux systems administration and foundational networking principles
Strong understanding of cloud environments and identity management tools (AWS experience highly regarded)
Working knowledge of system vulnerabilities, security issues and remediation best practices
Experience managing and troubleshooting complex enterprise systems in both on-premises and cloud contexts
Familiarity with Atlassian tools such as Confluence and Jira
Experience with help desk systems, escalation workflows, and service delivery frameworks
Strong analytical and problem-solving skills, with a collaborative, customer-centric approach
Excellent verbal and written communication skills, with the ability to explain technical concepts clearly

Job Responsibility

Maintain and support the integrity of Bluestaq’s systems and networks through technical support and configuration management
Perform daily monitoring, maintenance, and troubleshooting of applications, networks and systems in both cloud and on-premise environments
Ensure high availability and reliability of enterprise systems supporting 24/7 operations
Provide timely, solutions-focused support to users and stakeholders, fostering a culture of responsiveness and collaboration
Manage system installations, upgrades, patching, and automation initiatives to improve performance and security posture
Collaborate with cross-functional engineering and cybersecurity teams to strengthen system resilience and streamline processes
Support and enhance cloud identity and access management tools, ensuring compliance with security and Defence standards
Develop and maintain operational documentation, procedures, and knowledge bases for system continuity
Act as a mentor within the IT team, promoting learning, knowledge sharing and a continuous improvement mindset
Identify and mitigate potential risks through proactive monitoring, testing, and response planning

What we offer

Superannuation
Annual performance bonus
Private health cover allowance
Health/wellness allowance
Professional subscription
Salary sacrifice and salary packaging options
Additional 1 week of annual leave per year = 5 weeks per year
Other leave in accordance with the National Employment Standards and state long service leave legislation

Fulltime

Systems Administrator

This is an exciting opportunity to work within the company’s IT team. You will b...

Location

United Kingdom , Guildford

Salary:

Not provided

Actica Consulting

Expiration Date

Until further notice

Requirements

Computer Science or IT based academics
Experience of system administration within a Microsoft environment
Proactive and self-motivated
Ability to keep up with the rapid pace of ICT
Great problem solver that can think outside the box
Proficient in Active Directory
Managing Virtualised Infrastructure
Securing Information Systems
Experience of following IT Security Policy
Principles of Networking (DNS/DHCP/Layer 3 Firewalls/Routing)

Job Responsibility

Maintenance of company information systems
Acting as 1st and 2nd Line Support and escalate support requests as required
Liaising with IT suppliers
Attending relevant IT meetings and providing updates
Carrying out monitoring of systems to ensure system health and security
Maintenance of Firewall and gateway security policies
Responding to security alerts and liaising with System Security Officer on any incidents
Carrying out development work of new Information Services: build, test and roll-out to live

What we offer

25 days of paid leave per annum plus 8 UK bank holidays
Discretionary, Performance-Based Bonus Scheme
Enrolment in Stakeholder Pension Scheme
Cycle To Work Scheme
Employee Assistance Programme
Electric Vehicle Leasing Scheme
Private Medical Insurance
Mentor support
Performance and Development Manager
Career development and training

Fulltime

Systems Security Administrator

Robert Half

Location:
United States , San Antonio

Category:
IT - Administration

Contract Type:
Not provided

Salary:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
February 20, 2026

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